Acúmulo de nutrientes pelo cafeeiro sob interferência de plantas daninhas

Ronchi, Cláudio Pagotto; Terra, Ademir; Silva, A.A.; Ferreira, Lino Roberto

doi:10.1590/s0100-83582003000200007

Cited by 50 publications

(67 citation statements)

References 6 publications

(5 reference statements)

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“…It suggests that those macronutrients were limited for coffee plant uptake and then influenced on coffee growth. Ronchi et al (2007) concluded that competition for nutrients reduced coffee initial growth, delaying plant establishment and maturity, but, according to Ronchi et al (2003), growth reduction intensity depended on the weed species. In general, weeds are more competitive for nutrients than crops (Ronchi et al, , 2007, suggesting that nutrition is an important factor in the evaluation of weed-crop interaction.…”

Section: Resultsmentioning

confidence: 99%

Sourgrass densities affecting the initial growth and macronutrient content of coffee plants

2013

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-The objective of this work was to evaluate the coexistence effects of coffee (Coffea arabica) with densities of sourgrass (Digitaria insularis) on crop macronutrient content and plant growth. The experiment was conducted in plots where one coffee plant was maintained in coexistence with 0 (weed-free check), 1, 2, 4, 8, and 16 sourgrass plants, using a completely randomized design with three replicates. Reduction of coffee growth and macronutrient content, except P that increased, started when the coexistence occurred with sourgrass plants in a density of 1 plant per plot. In general, macronutrient content was reduced by 18-50%, while growth characteristics were reduced by 9-41%, when coffee plants coexisted with 16 plants of sourgrass. Thus, sourgrass competition for nutrients was a strong factor limiting coffee plant growth.Keywords: Coffea arabica, Digitaria insularis, competition, additive experiment, nutrients RESUMO -O objetivo deste trabalho foi avaliar os efeitos da convivência do cafeeiro (Coffea arabica) com densidades de capim-amargoso (Digitaria insularis) sobre o teor de macronutrientes e o crescimento das plantas da cultura. O experimento foi conduzido em caixas enterradas no solo, onde uma planta de café foi mantida em convivência com 0 (testemunha livre de plantas daninhas), 1, 2, 4, 8 e 16 plantas de capim-amargoso, usando o delineamento inteiramente casualizado com três repetições. A redução no crescimento e no teor de macronutrientes do cafeeiro -exceto P, que aumentou -iniciouse quando a convivência ocorreu com plantas de capim-amargoso na densidade de uma planta por caixa. Em geral, o teor de macronutrientes foi reduzido em 10-50%, enquanto as características de crescimento foram reduzidas em 9-41%, quando o cafeeiro conviveu com 16 plantas de capim-amargoso. Assim, a competição de capim-amargoso por nutrientes foi um forte fator limitante para o crescimento das plantas de café.Palavras-chave: Coffea arabica, Digitaria insularis, competição, experimento aditivo, nutrientes.

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Section: Resultsmentioning

confidence: 99%

Sourgrass densities affecting the initial growth and macronutrient content of coffee plants

2013

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“…Procedeu-se, portanto, para esta variável, apenas à análise descritiva, baseando-se no método usado por Ronchi et al (2003).…”

Section: Methodsunclassified

“…Sob densidade de cinco plantas por vaso de B. pilosa, o conteúdo relativo de nitrogênio, fósforo, potássio, cálcio e magnésio é cerca de 4, 14, 6, 7 e 9 vezes maior, respectivamente, nessa espécie do que na parte aérea de plantas de café cultivadas sem a interferência desta planta daninha (Ronchi et al, 2003). Além disso, Procópio et al (2004) verificaram que essa espécie apresenta elevada eficiência na utilização do nitrogênio absorvido, convertendo-o em biomassa.…”

Section: Introductionunclassified

Interferência de plantas daninhas no acúmulo de nutrientes e no crescimento de plantas de abacaxi

Catunda¹,

Freitas²,

Silva³

et al. 2006

Planta daninha

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O objetivo deste trabalho foi verificar os efeitos da interferência de Bidens pilosa, Cyperus rotundus e Digitaria horizontalis, em cinco densidades (0, 10, 20, 30 e 40 plantas por vaso), nos teores de nitrogênio, fósforo, potássio, cálcio e magnésio presentes na folha D e no comprimento desta, aos 30, 60 e 90 dias após o plantio do abacaxizeiro. Em geral, os teores dos nutrientes na folha D da cultura reduziram em razão do aumento da densidade das espécies de plantas daninhas, e os elementos mais extraídos aos 30 dias foram fósforo e potássio; além disso, C. rotundus e D. horizontalis foram as espécies que mais interferiram no teor nutricional do abacaxizeiro. Com relação ao comprimento da folha D, verificou-se comportamento análogo, ou seja, à medida que se aumentou a densidade de plantas daninhas, o valor dessa variável foi reduzido.

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“…Regarding the competition, Ronchi et al (2003) observed that the honey weed and other species of weeds caused a loss in the nutrient content of coffee plants, even in lower densities. Besides the interspecific competition, between coffee and honey weed, there is also the intraspecific competition, between individuals of the weed species (Ronchi et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Besides the interspecific competition, between coffee and honey weed, there is also the intraspecific competition, between individuals of the weed species (Ronchi et al, 2003). Ferreira et al (2011) noted that, in the second year of transition to organic coffee, honey weed was the most prevalent farming species, with a high relative density and abundance.…”

Section: Introductionmentioning

confidence: 99%

Growth and development of honey weed based on days or thermal units

et al. 2014

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-This work was carried out with the objective of evaluating the growth and development of honey weed (Leonurus sibiricus) based on days or thermal units (growing degree days). Thus, two independent trials were developed to quantify the phenological development and total dry mass accumulation in increasing or decreasing photoperiod conditions. Considering only one growing season, honey weed phenological development was perfectly fit to day scale or growing degree days, but with no equivalence between seasons, with the plants developing faster at increasing photoperiods, and flowering 100 days after seeding. Even day-time scale or thermal units were not able to estimate general honey weed phenology during the different seasons of the year. In any growing condition, honey weed plants were able to accumulate a total dry mass of over 50 g per plant. Dry mass accumulation was adequately fit to the growing degree days, with highlights to a base temperature of 10 o C. Therefore, a higher environmental influence on species phenology and a lower environmental influence on growth (dry mass) were observed, showing thereby that other variables, such as the photoperiod, may potentially complement the mathematical models.Keywords: Leonurus sibiricus, growing degree days, phenology, dry mass, biology RESUMO -Este trabalho foi desenvolvido com o objetivo de avaliar o crescimento e o desenvolvimento do rubim (Leonurus sibiricus) com base em dias ou unidades térmicas (graus dia). Para isso, dois experimentos independentes foram desenvolvidos

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Acúmulo de nutrientes pelo cafeeiro sob interferência de plantas daninhas

Cited by 50 publications

References 6 publications

Sourgrass densities affecting the initial growth and macronutrient content of coffee plants

Sourgrass densities affecting the initial growth and macronutrient content of coffee plants

Interferência de plantas daninhas no acúmulo de nutrientes e no crescimento de plantas de abacaxi

Growth and development of honey weed based on days or thermal units

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